Fix one of upstream non-determinism, tracked here:

https://github.com/JuliaLang/julia/issues/34115
https://github.com/JuliaLang/julia/issues/25900


Patch by Nicoló Balzarotti <nicolo@nixo.xyz>.

--- a/base/loading.jl
+++ b/base/loading.jl
@@ -807,7 +807,10 @@
         path = normpath(joinpath(dirname(prev), _path))
     end
     if _track_dependencies[]
-        push!(_require_dependencies, (mod, path, mtime(path)))
+          push!(_require_dependencies,
+                (mod, path,
+                 haskey(ENV, "SOURCE_DATE_EPOCH") ?
+                 parse(Float64, ENV["SOURCE_DATE_EPOCH"]) : mtime(path)))
     end
     return path, prev
 end
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<div class='path'>path: <a href='/guix/log/?id=78c318636e4a13c6fc0348ab3a9d4a3821c53e65'>root</a>/<a href='/guix/log/tests?id=78c318636e4a13c6fc0348ab3a9d4a3821c53e65'>tests</a>/<a href='/guix/log/tests/services.scm?id=78c318636e4a13c6fc0348ab3a9d4a3821c53e65'>services.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/services.scm?id=78c318636e4a13c6fc0348ab3a9d4a3821c53e65&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-05-18 22:29:54 +0200'>2022-05-18</span></td><td><a href='/guix/commit/tests/services.scm?id=3948ac25b1dccc40c7fdf56377f94a0775a835ee'>services: Make &lt;service-type&gt; 'description' field mandatory.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (&lt;service-type&gt;)[description]: Remove default value.
* tests/services.scm: Add 'description' field to each 'service-type' form.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-04-10 01:24:30 +0200'>2022-04-10</span></td><td><a href='/guix/commit/tests/services.scm?id=ec6a585ee2fd91c857276479411eedd0756e0093'>services: Test 'shepherd-service-upgrade' with transient services.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to eeb8ac43c8c0b0cc69422766070dbefc55f5c5c1.

* tests/services.scm ("shepherd-service-upgrade: transient service"):
New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-04-10 01:15:13 +0200'>2022-04-10</span></td><td><a href='/guix/commit/tests/services.scm?id=e25eca35ff04e4234d0376fbb9a8e146869772c8'>services: herd: Adjust to &lt;live-service&gt; changes.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to a2c759c8304c461d096ab763568e7f71546ff4e8.

* guix/scripts/system/reconfigure.scm (running-services): Fill in the
'transient?' field of &lt;live-service&gt;.
* tests/services.scm ("shepherd-service-upgrade: one unchanged, one upgraded, one new")
("shepherd-service-upgrade: service depended on is not unloaded")
("shepherd-service-upgrade: obsolete services that depend on each
other"): Adjust calls to 'live-service'.
</span></span></td><td>Ludovic Courtès</td></tr>